HPLUM 17 December 2003

HPLUM 17 December 2003

Prof Ian WilliamsDr B. SrigenganMr M. SureshMr Jarlath McKenna

Prof Roy Newell Dr Will Bryan Mrs Sarah Watson Miss Elizabeth English

Dr John Collier Dr Andrew LangleyDr Edwin DivallDr Chris Hooker

Ti: Sapphire at 790 nm (1.6 eV)Ti: Sapphire at 790 nm (1.6 eV)

Chirped Pulse AmplificationChirped Pulse Amplification

Terawatt (10Terawatt (101212 W) Lasers W) LasersASTRA ~20 mJ in ~50 fs in TA1ASTRA ~20 mJ in ~50 fs in TA1

High field physics ~ 10High field physics ~ 101717 Wcm Wcm-2-2

1 au = 3 x 101 au = 3 x 101616 Wcm Wcm-2-2

Repetition rate 10 HzRepetition rate 10 Hz

Top plate

Drift tube

Detector housing

Bottom plate

Gas-line

TOFMSION BEAM

Potential range (x)x0

Ato

mic

Pot

ent

ial w

ell

V0(x

)

Potential wellElectric field

e-e-

Keldysh Parameter,

P

P

U

I

2

214 ..103.9][ IxU eVP

Ponderomotive Potential, UP

I in Wcm-2 & in m

CORE

Xe +

Linearly Polarized Field

2

Circularly Polarized Field

Xe+

CORE

Xe4+Xe3+Xe2+

Z

Volume Effects & ISZ-Scanning

]zz1[I

Ilnzz1z

2V

20S

020

20z

]zz1[

r2exp

zz1

II

20

20

2

20

0)z,r(

21

20

020

20

1ln1

2

zzI

Izzr

S

Z-scan results from Xe neutral target

Tim

e of

Fli

ght (

sec)

Z Position (arb.)

Signal (arb.)

Typical time-of-flight spectra (z=0mm)

Time of Flight (s)

2.0 4.0 6.0 8.0

Ion Y

ield

(arb

. units)

-0.005

0.000

0.005

0.010

0.015

0.020

0.025

Xe8+

Xe+Xe2+

Xe6+

Xe7+

Xe5+Xe3+

Xe4+

Xe+

Xe2+

Xe3+

Xe4+Xe5+

Xe6+ Xe7+

Xe8+

132Xe2+

131Xe2+

129Xe2+

Xe+ Xe2+

Xe3+ Xe4+ Xe5+

Xe6+ Xe7+ Xe8+

TotalGreen-Linear-1.3Io

Blue- Circular- IO

ADK curves for production of Xe+ and Xe2+

Intensity (Wcm-2)

1013 1014 1015 1016

Ion

Yie

ld (

arb

. un

its)

101

102

103

104

105

106

107

108

109

1010

1011

Xe2+ (Intensity * 1.0) -CircularXe2+ (Intensity * 1.0) -LinearXe+ (Intensity * 1.0) -CircularXe+ (Intensity * 1.0) -Linear

ADK curves for production of Xe+ and Xe2+

Intensity (Wcm-2)

1013 1014 1015 1016

Ion

Yie

ld (

arb

. un

its)

101

102

103

104

105

106

107

108

109

1010

1011

Xe2+ (Intensity * 1.0) -CircularXe2+ (Intensity * 0.77) -LinearXe+ (Intensity * 1.0) -CircularXe+ (Intensity * 0.77) -Linear

= 0.5

21

3

3*3

Z

n

lin

circ

where

n* - effective principal quantum no.Z – charge state of residue ion– E-field

Z Position(mm)

Inte

gra

ted

Ion

Yie

ld (

arb

.)

Black - Linear-1.3Io

Blue- Circular Io

Z-Scan Result of Ne2+ from Ne

Comparison….ratio

ratio

Ion Yield

Ion Yield

Ne

XeXe

Ne

Ratio between double and single ionization of Ne and Xe

Becker and Faisal J Phys B 32 (1999) L335

t

Single and double ionization of Ne and Xe

-10 -5 0 5 10 15

0

5e-10

1e-9

2e-9

2e-9

volume fitcircular-Iolinear-1.3Io

Saturation Intensity Is(OTB model)=8.65*1013Wcm-2

Saturation Intensity Is(fit) =4.63*1013Wcm-2

Ionization Potential (literature) =12.4eVIonization Potential (fit) =10.4eV

Inte

gra

ted

Ion

Yie

ld (

arb

.)

Z Position(mm)

Z-Scan Result for Xe+ production from Xe

.].[2

][4

9][ 1000.42

ua

eVipWcms

q

VI

Z-Scan Result for Xe2+ production from Xe

-10 -5 0 5 10 15

Inte

gra

ted

Ion

Yie

ld (

arb

.)

0.0

2.0e-10

4.0e-10

6.0e-10

8.0e-10

1.0e-9

1.2e-9

1.4e-9

volume fitlinear-1.3Iocircular-Io

Z Position (mm)




-10 -5 0 5 10 15

0.0

2.0e-10

4.0e-10

6.0e-10

8.0e-10

1.0e-9

1.2e-9

volume fitlinear- 1.3Iocircular-Io



Ionization Potential (litertaure) =31.3eVIonization Potential (fit) =29.9eV


Inte

gra

ted

Ion

Yie

ld (

arb

.)

Z Position(mm)


Inte

gra

ted

Ion

Yie

ld (

arb

.)

-10 0 10 20 30 40

0

5e-10

1e-9

2e-9

2e-9

3e-9

3e-9

circular-Iolinear-Iolinear-1.3Iovolume fit-groundvolume fit-meta

Z Position (mm)

Inte

grat

ed

Ion

Yie

ld (

arb

.)

ground metaSat. Int. Is(OTB model)= 2.02*1014Wcm-2

Sat. Int. Is(fit) = 1.563*1014Wcm-2 3.782*1012Wcm-2

Ion. Potential. (lit.) = 21.2eVIon. Potential (fit) = 19.88eV 7.84eV

-10 0 10 20 30 40

0

5e-10

1e-9

2e-9

2e-9

3e-9

3e-9

volume fit-groundvolume fit-metalinear-1.3Iocircular-Io




Z-Scan Result for Xe2+ production from Xe+Z-Scan Result for Xe2+ production from Xe+

Inte

gra

ted

Ion

Yie

ld (

arb

.)

Z Position(mm)Metastable population

Xe+ 1.2%

Electronic states of XeElectronic states of Xe++

5s25p5

11.84eV

2P03/2, 1/2

4D7/2

3G04, 5

5D04

3F04

4F9/2, 7/2

2F7/2

1G04

4S03/2

3P2, 1, 0

12.33eV14.26eV

0.00eV

16.43eV

21.22eV0.00eV

13.83eV15.51eV16.40eV

32.14eV

5s25p4

5s25p3

Xe+

Xe2+

Xe3+

-5 0 5 10 15

0

2e-10

4e-10

6e-10

8e-10

1e-9

volume fit-groundvolume fit-metalinear-1.3Io

circular-Io




Inte

gra

ted

Ion

Yie

ld (

arb

.)

Z Position(mm)

Z-Scan Result for Xe3+ production from Xe2+

Metastable populationXe2+ 3.7%

Xe+ Xe2+

Xe3+ Xe4+ Xe5+

Xe6+ Xe7+ Xe8+

TotalGreen-Linear-1.3Io

Blue- Circular- IO

-10 -5 0 5 10 15

0.0

2.0e-10

4.0e-10

6.0e-10

8.0e-10

1.0e-9

1.2e-9

volume fitlinear- 1.3Iocircular-Io



Ionization Potential (litertaure) =31.3eVIonization Potential (fit) =29.9eV


Inte

gra

ted

Ion

Yie

ld (

arb

.)

Z Position(mm)


Inte

gra

ted

Ion

Yie

ld (

arb

.)

-5 0 5 10 15

0

2e-10

4e-10

6e-10

8e-10

1e-9

volume fit-groundvolume fit-metalinear-1.3Io

circular-Io




Inte

gra

ted

Ion

Yie

ld (

arb

.)

Z Position(mm)

Z-Scan Result for Xe3+ production from Xe2+

Metastable populationXe2+ 3.7%


Z Position (mm)

-10 -5 0 5 10 15

Inte

gra

ted

Ion

Yie

ld (

arb

.)

0.0

2.0e-10

4.0e-10

6.0e-10

8.0e-10

1.0e-9

1.2e-9

1.4e-9

volume fitlinear-1.3Iocircular-Io




-10 0 10 20 30 40

0

5e-10

1e-9

2e-9

2e-9

3e-9

3e-9

circular-Iolinear-Iolinear-1.3Iovolume fit-groundvolume fit-meta

Z Position (mm)

Inte

grat

ed

Ion

Yie

ld (

arb

.)




-10 0 10 20 30 40

0

5e-10

1e-9

2e-9

2e-9

3e-9

3e-9

volume fit-groundvolume fit-metalinear-1.3Iocircular-Io




Z-Scan Result for Xe2+ production from Xe+Z-Scan Result for Xe2+ production from Xe+

Inte

gra

ted

Ion

Yie

ld (

arb

.)

Z Position(mm)Metastable population

Xe+ 1.2%

No Significant NS Ionization in Ne2+

Documents

HPLUM 17 December 2003